The life history and immature stages of Banchus flavescens (Hymenoptera: Ichneumonidae), a parasitoid of the bertha armyworm, Mamestra configurata (Lepidoptera: Noctuidae) in western Canada.
The biology of Banchus flavescens parasitizing Mamestra configurata was investigated on rape in the laboratory. Female parasites attacked 1st-, 2nd- and 3rd-instar larvae, and the rate of parasite development was adjusted so that the 2nd instar was completed when the host finished feeding. In the field in western Canada, B. flavescens has an obligate diapause and overwinters as a prepupa within a cocoon in the soil. Notes on the life history and descriptions of the egg and 5 larval instars are given.